Gray dwarf hamster with white belly — lost

I lost my gray dwarf hamster yesterday around 3pm after I was unloading groceries outside the Walmart on San Dario Ave in Laredo. He's tiny, about 2 inches long, with a soft gray coat and a white belly. He has a tiny white patch on his left ear and a small pink scar on his right hind foot from an old scrape. He loves sunflower seeds and hiding in cardboard tunnels, so if you saw a little jittery thing darting through the bushes near the garden center, you might have spotted him. I’m really hoping to get him back—he’s my little buddy and this has me stressed.